Spec 4F, 3rd Edition Ballot Service Rig Rating

October 2009

Spec 4F, 3rd Edition Ballot
Service Rig Rating

3 Terms and Definitions

For the purposes of this document, the following terms and definitions apply.
3.1
angle of roll
angle of pitch
Angle of movement to one side from vertical.
.
.
.
3.34
service rig mast
a mast designed with ratings for operations with or without setback or rods.

NOTE See Table 7.2.

5 Marking and Information

5.1 Nameplate
Drilling and well-servicing structures manufactured in accordance with this standard shall be identified by
a nameplate bearing at least the information specified in 5.2 to 5.4, including the units of measurement
where applicable. Markings shall be either raised or stamped. The nameplate shall be securely affixed to
the structure in a conspicuous place.
5.2 Derrick and Mast Nameplate Information (except service rig masts)
The following information shall be provided:
a) manufacturer's name;
b) manufacturer's address;
c) date of manufacture, including month and year;
d) serial number;
e) height, m (ft);
f) maximum rated static hook load with guy lines, if applicable, for stated number of lines to travelling

block, KN (short tons);

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October 2009

g) maximum rated design wind velocity, Vdes, at reference elevation of 10 m (33 ft) above mean sea
level or ground, in knots, for 3-second gust duration with guy lines, if applicable, with rated capacity
of pipe racked, m/s (knots);

h) maximum rated design wind velocity, Vdes, at reference elevation of 10 m (33 ft) above mean sea
level or ground, in knots, for 3-second gust duration with guy lines, if applicable, without pipe racked,
m/s (knots);

i) elevation of base of derrick or mast above mean sea level or ground used in design for wind loading,
m (ft);

j) API Spec 4F, 3rd Edition;
k) manufacturer's guying diagram, if applicable;
l) the following text:
m) CAUTION Acceleration or impact, also setback, rods and wind loads will reduce the maximum rated

static hook load capacity.
n) manufacturer's load distribution diagram (may be placed in mast instructions);
o) graph plotting allowable static hook load for wind velocities varying from zero to maximum design

rated wind velocity, Vdes, with full rated setback, and with maximum number of lines to travelling
block;
p) mast set-up distance for mast with guy lines, m (ft);
q) PSL 2, if applicable; and
r) supplementary information as specified in the particular SR, if applicable (see Annex A).

5.3 Service Rig Mast Nameplate Information
The following information shall be provided:
a) manufacturer's name;
b) manufacturer's address;
c) date of manufacture, including month and year;
d) serial number;
e) height, m (ft);
f) maximum rated static hook load with guy lines, if applicable, for stated number of lines to travelling

block, KN (short tons);
g) allowable static hook load with guy lines, if applicable, for stated number of lines to travelling block,

KN (short tons) in combination with rated capacity of pipe racked and maximum rated capacity of
rods hung in mast, KN (short tons), if applicable;

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October 2009

h) maximum rated design wind velocity, Vdes, at reference elevation of 10 m (33 ft) above mean sea
level or ground, in knots, for 3-second gust duration with guy lines, if applicable, with rated capacity
of pipe racked, m/s (knots);

i) maximum rated design wind velocity, Vdes, at reference elevation of 10 m (33 ft) above mean sea
level or ground, in knots, for 3-second gust duration with guy lines, if applicable, without pipe racked,
m/s (knots);

j) elevation of base of derrick or mast above mean sea level or ground used in design for wind loading,
m (ft);

k) API Spec 4F, 3rd Edition;

l) manufacturer's guying diagram, if applicable;

m) the following text:

CAUTION: Acceleration or impact, also setback, rods and wind loads will reduce the maximum rated
static hook load capacity.

n) manufacturer's load distribution diagram (may be placed in mast instructions);

o) graph plotting allowable static hook load for wind velocities varying from zero to maximum design
rated wind velocity, Vdes, with full rated setback but no rods, and with maximum number of lines to
travelling block;

p) graph plotting allowable static hook load for wind velocities varying from zero to maximum design
rated wind velocity, Vdes, with full rated setback and full rated rods, and with maximum number of
lines to travelling block;

q) mast set-up distance for mast with guy lines, m (ft);

r) PSL 2, if applicable; and

s) supplementary information as specified in the particular SR, if applicable (see Annex A).

5.4 Substructure Nameplate Information

The following information shall be provided:

a) manufacturer's name;

b) manufacturer's address;

c) date of manufacture, including month and year;

d) serial number;

e) maximum rated static hook load, KN (short tons);

f) maximum rated static rotary capacity, KN (short tons);

g) maximum rated pipe setback capacity, KN (short tons);

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October 2009

h) maximum combined rated static hook and rated setback capacity, KN (short tons);
i) maximum combined rated static rotary and rated setback capacity, KN (short tons);
j) for substructures that support a mast or derrick, the following apply:

— maximum rated design wind velocity, Vdes, at reference elevation of 10 m (33 ft) above mean
sea level or ground, in m/s (knots), for 3-second gust duration with guy lines, if applicable, with
rated capacity of pipe racked;

— maximum rated design wind velocity, Vdes, at reference elevation of 10 m (33 ft) above mean
sea level or ground, in m/s (knots), for 3-second gust duration with guy lines, if applicable,
without pipe racked;

— elevation of base of substructure above mean sea level or ground used in design for wind
loading, m (ft);

k) API Spec 4F, 3rd Edition;
l) PSL 2, if applicable; and
m) supplementary information as specified in the particular SR, if applicable (see Annex A).
5.5 Crown Block Assembly Nameplate Information (required only for crown block
assemblies for use with derricks)
a) manufacturer's name;
b) manufacturer's address;
c) date of manufacture, including month and year;
d) serial number;
e) maximum rated static hook load, KN (Short Tons);
f) API Spec 4F, 3rd Edition;
g) PSL 2, if applicable; and
h) supplementary information as specified in the particular SR, if applicable (see Annex A).

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October 2009

7 Design Loading

Each drilling structure shall be designed for combinations of loads in accordance with Table 7.1 or
Table 7.2, as applicable. The structures shall be designed to meet or exceed these conditions in
accordance with the applicable design specifications of Section 8.

Table 7.1—Design Loadings for Drilling Structures1

Case Design Dead Hook Rotary Setback Environmental
Loading Load12 Load23,4 Load Load4 Loads5
Condition
(%) (%) (%) (%)

1a Operating 100 100 0 100 100% operating
environment

1b Operating 100 TE 100 100 100% operating
environment

100% expected

2 Expected 100 TE 100 0 storm

environment

100%

3a Unexpected 100 TE 100 100 unexpected
storm

environment

3b Unexpected 100 As As As 100%
applicable applicable applicable earthquake

4 Erection 100 As As 100% erection
applicable applicable 0 operating

0 environment

5 Transportation 100 As As As 100%
applicable applicable applicable transportation
environment
0

1 Excludes service rig masts (see Table 7.2).

12 For stability calculations, lower values of dead load shall be considered as in 8.8.

23 For non-operating wind environments, the weight of all travelling equipment and drill lines suspended
from the crown (TE) shall be considered in all load cases, as applicable.

4 Substructures which do not support a mast or derrick need not be designed for hook load. Similarly,
substructures which do not support setback need not be designed for setback load.

5 Environmental loads include the full design sail area for setback, if applicable.

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October 2009

Table 7.2—Design Loadings for Service Rig Masts

Case Design Dead Hook Setback Rods Environmental
Loading Loada Loadb Load Hung in Loadsc
Condition
(%) (%) (%) Mast

(%)

1a Operating 100 100 0 0 100% operating
environment

1b Operating 100 TBD 100 0 100% operating
environment

1c Operating 100 TBD 100 100 100% operating
environment

100% expected

2 Expected 100 TE 0 0 storm

environment

100%

3a Unexpected 100 TE 100 100 unexpected
storm

environment

3b Unexpected 100 As As As 100%
applicable applicable applicable earthquake

4 Erection 100 As 0 0 100% erection
applicable environment

5 Transportation 100 As As As 100%
applicable applicable applicable transportation
environment

a For stability calculations, lower values of dead load shall be considered as in 8.8.

b For non-operating wind environments, the weight of all travelling equipment and drill lines suspended
from the crown (TE) shall be considered in all load cases, as applicable.

c Environmental loads include the full design sail area for setback and rods, if applicable.

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